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Insert without duplicates ?

Insert without duplicates ?

Insert without duplicates ?

How to insert a record making sure there's no duplicate ?
INSERT INTO invoices (invoiceid, billed) VALUES ('12345', 'TRUE')
WHERE NOT EXISTS (SELECT * FROM invoices WHERE invoices.invoiceid = '12345')

I keeps getting an error message and can't figure out how to do this ?
Syntax error at or near "WHERE"

Much TIA's

RE: Insert without duplicates ?

Or this variation on the same theme

IF EXISTS (SELECT * FROM invoices WHERE invoiceid = '12345')
UPDATE invoices SET billed = 'TRUE' WHERE invoiceid = '12345'
INSERT INTO invoices (invoiceid, billed) VALUES ('12345', 'TRUE')


RE: Insert without duplicates ?


Maybe :


insert into invoices (invoiceid,billed)
select '12345','true' where not exists (select 1 from invoices where invoiceid='12345')
Regarding the second form, needs a stored procedure :


create or replace function putinvoice(varchar(10),varchar(5))
returns boolean as '
  _invoiceid alias for $1;
  _billed alias for $2;
  update invoices set billed=_billed where invoiceid=_invoiceid;
  if not found then
    insert into invoices (invoiceid,billed) values (_invoiceid,_billed);
  end if;
  return true;
' language plpgsql;


RE: Insert without duplicates ?

Still trying to get this working.


DROP TABLE invoices;
CREATE TABLE invoices (
    invoiceid VARCHAR(5),
    billed BOOLEAN,
    CONSTRAINT idkey PRIMARY KEY (invoiceid)
INSERT INTO invoices (invoiceid, billed)
VALUES ('12345', 'true') WHERE NOT EXIST (SELECT 1 FROM INVOICES WHERE invoiceid = '12345');

ERROR: syntax error at or near "WHERE"
SQL state: 42601
Character: 213

Grateful for any more clues.
Hoping to keep this simple rather than use stored procedure.

RE: Insert without duplicates ?

Sorry, I meant SELECT not VALUES


INSERT INTO invoices (invoiceid, billed)
SELECT ('12345', 'true') WHERE NOT EXIST (SELECT 1 FROM INVOICES WHERE invoiceid = '12345');
throws error as above.
TIA's for clues

RE: Insert without duplicates ?

Ok, finally got it.
For completeness, and maybe to help anybuddy else who hits this problem, this seems to work reliably.
Hope others can avoid repeating my mistake, just make new ones.


insert into invoices (invoiceid, billed) (select '12345' as invoiceid, 'TRUE' as billed where
not exists (select 1 from invoices where invoiceid='12345'));

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